Adjust motor. Left.2021-23. mix. PartQualifier: mix. An Actuator used to control the hvac defrost mode Door. Switches modes for the blend Doors. Stepper. Adjust. HVAC Air. HVAC Blend. HVAC Defrost Mode. HVAC Mix. HVAC Temperature. Servo. Included with: AC & heater assembly, Evaporator assembly.